WO2000069776A1 - Particules d'oxyde de zinc a activite de surface supprimee, leur production et leur utilisation - Google Patents
Particules d'oxyde de zinc a activite de surface supprimee, leur production et leur utilisation Download PDFInfo
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- WO2000069776A1 WO2000069776A1 PCT/JP2000/003046 JP0003046W WO0069776A1 WO 2000069776 A1 WO2000069776 A1 WO 2000069776A1 JP 0003046 W JP0003046 W JP 0003046W WO 0069776 A1 WO0069776 A1 WO 0069776A1
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
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- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
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- A61K8/25—Silicon; Compounds thereof
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- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/27—Zinc; Compounds thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
- A61Q17/04—Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/04—Compounds of zinc
- C09C1/043—Zinc oxide
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
- A61K2800/41—Particular ingredients further characterized by their size
- A61K2800/413—Nanosized, i.e. having sizes below 100 nm
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- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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- C01P2006/63—Optical properties, e.g. expressed in CIELAB-values a* (red-green axis)
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- C01P2006/64—Optical properties, e.g. expressed in CIELAB-values b* (yellow-blue axis)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
- Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
- Y10T428/2995—Silane, siloxane or silicone coating
Definitions
- the present invention has a coating layer made of zinc gayate on the surface, has a significantly suppressed surface activity, blocks ultraviolet rays in a long wavelength region around 400 nm, and has a
- the present invention relates to zinc oxide particles having excellent shielding properties and excellent transparency, and to their production and use. Background art
- the partial depletion of the ozone layer has increased the absolute amount of UV radiation that reaches the earth's surface, which has led to increased interest in protecting the human body from UV radiation.
- there are two types of ultraviolet rays that reach the surface of the earth those in the B region of 290 to 320 nm and those in the A region of 320 to 400 nm.
- organic ultraviolet absorbers have been widely used for films, paints, and sunscreen cosmetics.
- the blended organic ultraviolet absorber migrates to the surface layer of the film or coating over time, so-called bleed-out occurs.
- the ultraviolet ray absorbent decomposes and the ultraviolet ray shielding effect deteriorates.
- organic UV absorbers have a problem in skin irritation in the cosmetics field, and in addition, the UV absorption wavelength of organic UV absorbers is limited to a specific region.
- inorganic UV absorbers have been widely used, especially Child rutile type titanium oxide is widely used in the fields of paints and cosmetics. Since rutile-type titanium oxide has a large refractive index (2.7), it has a strong hiding power despite being ultra-fine particles. Thus, when it is blended into resin moldings and paints, When transparency is insufficient, and when sunscreen cosmetics containing ultrafine rutile-type titanium oxide are applied to the skin, the ultrafine rutile-type titanium oxide strongly scatters blue light and often gives a pale color. There is also a problem that makes the skin look unhealthy. Furthermore, the shielding property against ultraviolet rays in the A region is insufficient.
- a composite oxide of Ti, Si and Fe has been proposed as a titanium oxide having excellent shielding properties against ultraviolet rays in the region A (Japanese Patent Application Laid-Open No. 9-30933).
- an ultrafine ruthenium-type titanium oxide having a steel structure has been proposed as a useful one for sunscreen cosmetics while suppressing the bluish color tone (Japanese Patent Laid-Open No. 5-330825).
- these materials still have an insufficient ability to block ultraviolet rays in the A region, and have a large refractive index, so that they tend to hide the underlayer. When blended, there is a problem that the sense of transparency is lost.
- ultrafine zinc oxide has a sharp absorption edge at the ultraviolet wavelength of 380 nm, has the property of shielding most of the ultraviolet light in the A region as well as the B region, and has a refractive index of Since it is small (2.0), it is very transparent, and in recent years has attracted much attention as an ultraviolet absorber. Conventionally, it has been mainly used in the cosmetics field, but due to its excellent properties, it is being used not only in the cosmetics field but also in various fields.
- ultrafine zinc oxide is used as an ultraviolet absorber.
- a thermoplastic resin such as polyethylene terephthalate-polycarbonate
- ultrafine zinc oxide accelerates the decomposition of these resins and significantly impairs moldability.
- the zinc oxide reacts with the resin binder, causing the paint to become viscous over time and gelling. There is a problem to do.
- zinc oxide originally has the property of being slightly dissolved in water, and the physiological action of the eluted zinc ion has long been used as an astringent in the cosmetics field. Furthermore, the chemical reactivity of reacting with fatty acids to produce metallic soap is used as a deodorant effect, which absorbs sebum secreted from the skin J » improves makeup durability, and absorbs body odor components. Sometimes.
- zinc oxide particles coated with these hydroxides have a fatal deficiency of promoting the hydrolysis of polyethylene terephthalate and polycarbonate resins.
- the overcoat layer has a wavelength of up to 400 nm Force required not to be transmitted
- ultrafine zinc oxide alone cannot shield light of more than 380 nm due to its properties.
- the present invention has been made to solve the above-mentioned problems in zinc oxide particles, in particular, ultrafine zinc oxide, and has been developed in order to solve the above-mentioned various problems in conventional ultrafine zinc oxide.
- To provide zinc oxide particles having reduced surface activity preferably ultrafine zinc oxide, capable of providing safe and effective ultraviolet shielding properties to products in a wide range of fields such as cosmetics and cosmetics, and a method for producing the same. aimed to.
- Another object of the present invention is to provide uses of such zinc oxide particles, particularly resin molded articles, paints and cosmetics.
- a further object of the present invention is to provide ultrafine zinc oxide which can effectively block ultraviolet rays in a long wavelength region around 400 nm. Disclosure of the invention
- Zinc oxide particles with less surfactant according to the present invention Kei zinc and against the zinc oxide on the surface (Orutokei zinc, Z n z S i 0 4 ) 0. 5 ⁇ 5 0 by weight% in terms of Preferably, it has a coating layer made of zinc silicate in the range of 1 to 15% by weight.
- Kei zinc terms This Kei zinc is intended to mean a Orutokei zinc (Z n 2 S i 0 4 ).
- a water-insoluble zinc compound that can be converted to zinc oxide by heating in air in addition to the zinc oxide particles themselves, a water-insoluble zinc compound that can be converted to zinc oxide by heating in air (specific examples are described later).
- a neutralizing agent when obtaining zinc oxide particles having a solid solution of iron or cobalt and having a coating layer made of zinc silicate on the surface, neutralization with a neutralizing agent is carried out.
- a water-soluble salt that produces a water-insoluble zinc compound (a specific example will be described later) can be used.
- the water-insoluble zinc compound or the water-soluble zinc salt used as a starting material for zinc oxide is formed (strictly, stoichiometric amount) with respect to zinc oxide. It means that.
- Zinc oxide particles with reduced such surface activity the aqueous suspension of particles of the water-insoluble zinc compounds, each of the aqueous solution gay zinc soluble Kei salt and a water-soluble zinc salt (Z n 2 S i O 4) in a stoichiometric ratio to form a, and, Gay zinc with respect to zinc oxide (Z n z S i O 4 ) was added to an amount ranging from 0.5 to 5 0 wt% in terms of Washing, drying, and then heating to a temperature in the range of 300 to 1200 to form zinc oxide particles and form a coating layer of zinc silicate on the surface of the particles.
- Gay zinc with respect to zinc oxide Z n z S i O 4
- water-insoluble zinc compound for example, zinc oxide, zinc hydroxide, zinc carbonate, basic zinc carbonate, zinc sulfide, zinc oxalate and the like are used.
- the zinc oxide and the water-soluble gay acid salt are formed in a stoichiometric ratio to form zincate (Zn 2 Si 0 4 ).
- a predetermined amount of iron hydroxide or cobalt hydroxide is added to the zinc compound particles in advance with respect to zinc oxide.
- suspension Kei zinc such as this (Z n 2 S i 0) each water-soluble Kei salt and a water-soluble zinc salt in a stoichiometric ratio to form a
- the aqueous solution it may be washed with water, dried, and heated to a temperature in the range of 300 to 1200 ° C.
- the zinc compound particles are converted into zinc oxide particles, that is, zinc oxide particles are generated from the zinc compound particles, and iron or cobalt is dissolved in the zinc oxide particles.
- a zinc gayate layer is formed on the surface of the particles.
- the iron or cobalt solid solution is optionally may zinc oxide surface also, Kei zinc relative zinc oxide (Z n 2 S i 0 4 ) the range of from 0.5 to 5 0 wt% in terms of A first coating layer comprising zinc gayate of the following formula, and further, on the basis of zinc oxide, A 1, T i, Z r in the range of 0.5 to 30% by weight as oxides based on zinc oxide;
- the present invention provides zinc oxide particles having reduced surface activity and having a second coating layer made of an oxide of at least one element selected from the group consisting of Sn, Sb and a rare earth element.
- Such zinc oxide particles are prepared by preparing zinc oxide particles having a coating layer made of zinc silicate on the surface of zinc oxide particles in which iron or cobalt may be dissolved in solid form. After adding an aqueous solution of a water-soluble compound of at least one element selected from the group consisting of aluminum, silicon, tin, zirconium, antimony and rare earths to the aqueous suspension of particles, neutralize the acid or alkali In addition, it can be obtained by neutralizing the water-soluble compound of the above element and precipitating it on the surface of the zinc oxide particles to form a second coating layer made of an oxide of the above element.
- the above-described zinc oxide particles according to the present invention may be further treated with an organic silicon compound, a higher fatty acid, a higher fatty acid ester, metal soap, a polyhydric alcohol or an alkanolamine, if necessary.
- Such zinc oxide particles according to the invention preferably have an average particle diameter of less than 0.15 m.
- FIG. 1 is an X-ray diffraction chart of zinc oxide particles according to the present invention (Example 1).
- FIG. 2 is an X-ray diffraction chart of the zinc oxide ultrafine particle powder (Comparative Example 2).
- FIG. 3 is a graph showing the light transmittance of the ultra-fine cobalt solid solution zinc oxide particles according to the present invention.
- the zinc oxide particles used as a raw material in the present invention are obtained by evaporating and oxidizing an electro-zinc metal, zinc hydroxide and a carbonate obtained by adding an aqueous solution of a water-soluble salt such as zinc sulfate or zinc chloride.
- a water-soluble salt such as zinc sulfate or zinc chloride.
- the zinc oxide particles used as a raw material preferably have high transparency, and therefore, preferably have an average primary particle diameter of 0.15 / m or less.
- the average primary particle size is larger than 0.15 / m, the hiding power is large.
- zinc oxide particles having an average primary particle diameter of more than 0.15; m may be used as a raw material.
- the lower limit of the average primary particle size of the zinc oxide particles used as a raw material is not particularly limited, but is usually 0.01 m.
- the average primary particle diameter is defined as a diameter in a certain direction (a so-called FERRET diameter) in a field of view of 100,000 times that of a transmission electron microscope.
- Zinc oxide particles which suppresses surface activity according to the invention its Kei zinc for the zinc oxide on the surface (Z n 2 S i 0 4 ) 0. 5 ⁇ 5 0 wt% in terms of, preferably 1-1 It has a coating layer made of zinc silicate in the range of 5% by weight.
- the proportion of Kei zinc in the zinc oxide particles according to the present invention is less than 0.5 wt% in Kei zinc (Z n z S i 0 4 ) conversion calculation is sufficient surface activity of zinc oxide is inherent, On the other hand, when the content is more than 50% by weight, the ultraviolet shielding effect of zinc oxide is significantly reduced.
- Zinc oxide particles according to the invention the aqueous suspension of the starting zinc oxide particles, stoichiometry to form the Kei zinc (Z n z S i C) of each of the aqueous solution of a water-soluble Kei salt and a water-soluble zinc salt in logical ratio, and, the Gay zinc relative zinc oxide (Z n z S i ⁇ ) was added to an amount of 0.5 to 5 0% by weight of the range in terms, washed with water, dried, then 3 It can be obtained by heating to a temperature in the range of from 1000 to 1200 to form zinc oxide particles and forming a zinc silicate layer on the surface of the particles.
- an aqueous suspension of the zinc oxide particles in order to prepare an aqueous suspension of the zinc oxide particles, it is preferable to suspend zinc oxide particles sufficiently pulverized by a pulverizer such as a sand mill in water.
- the concentration of the zinc oxide particles in the suspension is preferably in the range of 50 to 250 gZL.
- the preparation of the aqueous suspension of zinc oxide particles and the concentration of the zinc oxide particles in the suspension are not limited to the above examples.
- a neutralizing agent may be added to adjust the pH.
- water-soluble silicate an alkali metal silicate such as sodium gayate or potassium silicate is preferably used.
- water-soluble zinc salt an inorganic acid salt such as zinc sulfate or zinc chloride is used. It is preferably used, but is not limited thereto.
- aqueous solution of the water-soluble calcium salt and the aqueous solution of the water-soluble zinc salt to the suspension of the zinc oxide particles either of them may be added first, or both may be added simultaneously.
- zinc oxide particles are separated from the suspension thus obtained, washed, and, if necessary, dried, for example, under an oxidizing atmosphere such as air. Heating to a temperature in the range of 300 to 1200, firing, and then Oxidation according to the present invention having a coating layer made of zinc silicate having an average particle size of 0.01 to 0.15 m by dry milling with a suitable mill such as a mer mill, edge runner mill, or jet mill. Zinc particles can be obtained.
- the firing temperature is in the range of 500 to 110, most preferably in the range of 600 to 100,000.
- a water-soluble silicate is added to an aqueous suspension of water-insoluble zinc compound particles, then a neutralizing agent is added, and the mixture is aged, washed with water, dried, and further fired.
- a coating layer made of zinc gayate can be formed on the surface of the zinc compound particles.
- the zinc oxide particles according to the present invention have a coating layer made of zinc gayate on the surface thereof, when dispersed in an appropriate medium, the coating layer made of zinc silicate becomes a zinc oxide particle.
- the coating layer made of zinc silicate becomes a zinc oxide particle.
- any water-insoluble zinc compound that can be converted to zinc oxide by heating in air such as zinc hydroxide, zinc carbonate, basic zinc carbonate, zinc sulfide, zinc oxalate, etc.
- zinc it can be used as a raw material.
- each of the aqueous solution gay zinc soluble Kei acid and a water-soluble zinc salt (Z n z S i 0.) in a stoichiometric ratio to form a and, Kei zinc (Z n 2 S i 0 4 to acid zinc) was added in an amount of 0.5 to 5 0% by weight of the range in terms of After that, wash with water, dry, and then heat in the range of 300 to 1200 When heated, the zinc compound particles are converted into zinc oxide particles, and a coating layer made of zinc silicate is formed on the surface.
- iron is solid-dissolved in zinc oxide in a range of 0.1 to 20% by weight in terms of iron, and zinc silicate (Z n z S i 0 4) 0. 5 ⁇ 5 0 wt% in terms of, preferably, ⁇ solid solution of zinc oxide particles having a coating layer made of Gay zinc in the range from 1 to 1 to 5 wt% Ru is provided.
- the amount of iron dissolved in the zinc oxide is 0.1 to 20% by weight, preferably 0.5 to 15% by weight, and Preferably, it is in the range of 1 to 10% by weight.
- the amount of iron dissolved in the zinc oxide is 0.1 to 20% by weight, preferably 0.5 to 15% by weight, and Preferably, it is in the range of 1 to 10% by weight.
- the amount of iron dissolved in zinc oxide is less than 0.1% by weight in terms of iron, the effect of shielding ultraviolet rays in the A region having a wavelength longer than 380 nm is insufficient. If it is more than 10%, part of the iron will be present separately from zinc oxide without being dissolved in the zinc oxide, causing problems such as color separation when blended in paints or emulsions.
- such an iron-dissolved zinc oxide particle is prepared by adding an aqueous solution of a water-soluble iron salt in an amount of 0.1 to 20% by weight based on zinc oxide to an aqueous suspension of the zinc oxide particle.
- a neutralizing agent is added to form an iron hydroxide layer on the surface of the zinc oxide particles, and then, as described above, the aqueous suspension containing such zinc oxide particles in the respective aqueous solution of a water-soluble Kei salt and a water-soluble zinc salt in a stoichiometric ratio to form a Kei SanA lead (Z n z S i 0 4 ), and, Quai i zinc against zinc oxide (Z n z S i C) was added to an amount ranging from 0.5 to 5 0 wt% in terms of Wash with water, dry, and then heat to a temperature in the range of 300 to 1200 to dissolve iron in the zinc oxide particles and form a coating layer made of zinc gayate on the surface.
- an aqueous suspension of zinc oxide particles is used in an amount of 0.1 to 20 weight in terms of iron with respect to zinc oxide.
- % of a water-soluble iron salt and then a neutralizing agent to neutralize the suspension.
- Preferred examples of the water-soluble iron salt include, but are not limited to, ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, ferrous nitrate, and ferric nitrate. It is not something to be done.
- the neutralizing agent is not particularly limited, but sodium hydroxide, potassium hydroxide, ammonium hydroxide and the like are preferably used.
- a water-soluble aqueous solution of silicate and a water-soluble aqueous solution of zinc salt are added thereto as described above.
- Gay zinc relative zinc oxide (Z n z S i 0 4 ) the range of from 0.5 to 5 0 wt% in terms of
- zinc oxide can be converted into zinc oxide by heating in air, such as zinc hydroxide, zinc carbonate, basic zinc carbonate, zinc sulfide, zinc oxalate, etc.
- An aqueous suspension is prepared using particles of a water-insoluble zinc compound that can be converted, and the aqueous suspension is adjusted to have a concentration of 0.1 to 20% by weight in terms of iron based on zinc oxide.
- a neutralizing agent is added, and the pH of the suspension is adjusted to a range of 6.0 to 9.0.
- the iron oxide is deposited, and then, as described above, the aqueous suspension of such zinc compound particles is treated with a water-soluble silicate and a water-soluble salt. After adding each aqueous solution of zinc salt, it is washed, dried and heated to generate zinc oxide particles, dissolve iron in the particles and form a coating layer made of zinc gayate on the surface. By doing so, the zinc oxide particles according to the present invention can be obtained.
- a mixture of an aqueous solution of a water-soluble zinc salt and an aqueous solution of a water-soluble iron salt is prepared, and a neutralizing agent is added to the mixture to prepare zinc hydroxide, zinc carbonate, basic zinc carbonate,
- a water-insoluble iron compound eg, iron hydroxide
- a water-insoluble zinc compound eg, zinc hydroxide
- zinc hydroxide such as zinc sulfide and zinc oxalate
- the zinc oxide particles according to the present invention having the coating layer made of zinc silicate on the surface of the zinc oxide particles in which iron is dissolved are excellent in the ability to shield ultraviolet rays in the A region of at least 380 nm, and
- the coating layer made of zinc silicate completely separates the zinc oxide particles from the medium.
- the solubility in pure water and the reactivity with other components can be significantly suppressed, and the photocatalytic activity can be almost completely suppressed.
- the cobalt is 0.5 to 30% by weight, preferably 1 to 25% by weight, particularly preferably 1 to 25% by weight, based on the zinc oxide, in the cobalt oxide (CoO) conversion. ,. 3-2 0 with being dissolved in a weight percent range, Kei zinc to oxidation of zinc on the surface (Z n z S i O 4 ) 0. 5 ⁇ 5 0 wt% in terms of, preferably Provides cobalt-dissolved zinc oxide particles having a coating layer of zinc silicate in the range of 1 to 15% by weight.
- Such cobalt-dissolved zinc oxide particles can also be obtained in the same manner as the iron-dissolved zinc oxide particles described above. That is, the cobalt solid solution zinc oxide particles To the aqueous suspension of lead particles is added an aqueous solution of a water-soluble cobalt salt in an amount of 0.5 to 30% by weight in terms of cobalt oxide (CO) based on zinc oxide, and then a neutralizing agent is added. A cobalt hydroxide layer is formed on the surface of the zinc oxide particles, and then, as described above, the aqueous suspension containing the zinc oxide particles is added with a water-soluble gaylate and a water-soluble zinc.
- cobalt oxide CO
- Kei zinc Z n 2 S i 0 *
- Kei zinc relative zinc oxide Z n z S i 0 4
- an aqueous suspension of zinc oxide particles may be coated with cobalt oxide against zinc oxide.
- a neutralizing agent may be added to neutralize the suspension.
- the water-soluble cobalt salt for example, cobalt chloride, cobalt sulfate, cobalt nitrate and the like are preferably used, but not limited thereto.
- the neutralizing agent is not particularly limited, but sodium hydroxide, potassium hydroxide, ammonium hydroxide and the like are preferably used.
- an aqueous solution of a water-soluble silicate and an aqueous solution of a water-soluble zinc salt are added thereto as described above.
- a zinc (Z n 2 S i 0 4 ) washed with water, dried and then heated to a temperature in the range of 3 00-1 200 hand, in the zinc oxide particles It can be obtained by dissolving cobalt and forming a zinc silicate layer on its surface.
- heating is performed without using zinc oxide particles, such as zinc hydroxide, zinc carbonate, basic zinc carbonate, zinc sulfide, zinc oxalate, and the like.
- an aqueous suspension is prepared using particles of a water-insoluble zinc compound that can be converted to zinc oxide, and this aqueous suspension is converted to zinc oxide in terms of cobalt oxide (C 00).
- a neutralizing agent is added to adjust the pH of the suspension to 6.0 to 9.0.
- cobalt hydroxide is deposited on the surface of the water-insoluble zinc compound particles, and then, as described above, a water-soluble silicate and a water-soluble zinc are added to the aqueous suspension of such zinc compound particles.
- a water-soluble silicate and a water-soluble zinc are added to the aqueous suspension of such zinc compound particles.
- the present invention is also applicable.
- the cobalt solid solution zinc oxide particles according to the invention can be obtained.
- the cobalt solid solution zinc oxide particles are prepared by mixing a mixed aqueous solution of a water-soluble zinc salt and a water-soluble cobalt salt with a neutralizing agent, preferably in a pH range of 6.0 to 9.0.
- a neutralizing agent preferably in a pH range of 6.0 to 9.0.
- Kei zinc Z n z S i O 4
- heating is performed to a temperature in the range of 300 to 120 O'C to obtain a solid solution of cobalt in the generated zinc oxide particles and to form a coating layer made of zinc gayate on the surface. be able to.
- cobalt solid solution zinc oxide particles when the cobalt solid solution amount is less than 0.5% by weight in terms of cobalt oxide (C 00) with respect to zinc oxide, it is 380 to 420 nm. When there is almost no shielding effect against ultraviolet rays in a long wavelength region, and when it is more than 30% by weight, the transmittance of visible light, that is, the transparency, is significantly reduced.
- the cobalt-dissolved zinc oxide particles according to the present invention not only have an excellent ability to block ultraviolet light in the long wavelength region of 380 to 420 nm, but also disperse the same in a medium to be used in cosmetics and paints.
- the surface consisting of zinc silicate The coating layer completely separates the cobalt-containing zinc oxide particles from the medium, thus significantly reducing, for example, solubility in pure water and reactivity with other components. Photocatalytic activity can also be almost completely suppressed.
- the lower limit of the average primary particle diameter of the zinc oxide particles of the present invention is not particularly limited, but is usually 0.01 ⁇ m.
- the zinc oxide particles having the first coating layer made of zinc gayate on the zinc oxide particles in which iron or cobalt may be dissolved, further comprising aluminum, silicon may have a second coating layer made of an oxide of at least one element selected from the group consisting of tin, zirconium, antimony and rare earths.
- the second coating layer preferably has a range of 0.5 to 30% by weight, particularly preferably 2 to 15% by weight, based on zinc oxide.
- the rare earth element include yttrium, lanthanum, cerium, neodymium, and the like.
- the zinc oxide particles according to the present invention having such a second coating layer are prepared, for example, by preparing zinc oxide particles having a coating layer made of zinc gayate on the surface as described above, and then suspending the particles in water. Then, an aqueous suspension is prepared, and an aqueous solution of a water-soluble compound of the above element is added to the suspension, and then an acid or aluminum salt is added as a neutralizing agent to obtain a water-soluble compound of the above element. It can be obtained by neutralizing and precipitating on the surface of the zinc oxide particles, separating such zinc oxide particles, and, if necessary, drying and firing.
- water-soluble compounds of aluminum include aluminum nitrate, aluminum sulfate, and sodium aluminate.
- water-soluble compounds of silicon include, for example, sodium gayate, and examples of water-soluble compounds of tin.
- salt examples of water-soluble compounds of tin oxide and zirconium include, for example, zirconium nitrate and zirconium sulfate.
- water-soluble compounds of antimony include antimony chloride and the like.
- water-soluble compounds of rare earth elements include And cerium nitrate.
- an acid or an alkali is used as the neutralizing agent, and examples of the acid include inorganic acids such as sulfuric acid and hydrochloric acid; Organic acids such as acetic acid and oxalic acid are preferably used.
- the alkali metal for example, sodium hydroxide, lithium hydroxide, and ammonium hydroxide are preferably used.
- a coating layer made of an oxide of two or more kinds of elements is formed.
- a coating layer composed of oxides of a plurality of elements may be formed at a time using an aqueous solution of a water-soluble compound of a plurality of elements. It is preferable to form a second coating layer in multiple layers by sequentially forming a coating layer made of the oxide one by one. In particular, when forming a coating layer containing aluminum oxide as the second coating layer, it is desirable to form the coating layer made of aluminum oxide last.
- a first coating layer made of zinc silicate on the surface of zinc oxide particles After forming the coating layer, such zinc oxide particles may be surface-treated with a surface treating agent selected from an organic silicon compound, a polyhydric alcohol and an alkanolamine.
- a surface treatment agent selected from an organic silicon compound, a polyhydric alcohol and an alkanolamine.
- Such a surface treatment agent is used in an amount of usually from 1 to 20% by weight, preferably from 1 to 10% by weight, based on zinc oxide.
- organosilicon compounds examples include organopolysiloxanes such as methyl hydrazine siloxane, xanthine dimethyl siloxane, and triethyl siloxane.
- silane coupling agent examples include xylvinylsilane diphenyldimethoxysilane and the like.
- polyhydric alcohol examples include trimethylolethane, trimethylolpropane, and pentaerythritol.
- alkanolamine examples include, for example, diethanolamine, dipropanolamine, triethanolamine, and tripropanolamine.
- the treatment amount with such a surface treatment agent is less than 1% by weight with respect to zinc oxide, the effect of improving the dispersibility of the zinc oxide particles according to the present invention is poor, and on the other hand, when the amount exceeds 20% by weight. However, since the dispersibility is saturated, it is economically disadvantageous.
- the zinc oxide particles are converted into carbon atoms.
- Higher fatty acids such as, for example, lauric acid, stearic acid, and balmitic acid, such as lauric acid, stearic acid, and balmitic acid; alkyl esters of these higher fatty acids, such as octyl palmitate; for example, aluminum stearate, aluminum laurate
- the metal species constituting the metal soap is not limited to aluminum, and examples thereof include lithium, magnesium, calcium, strontium, barium, zinc, aluminum, and tin.
- the amount is usually 1 to 20% by weight based on zinc oxide. %, Preferably 1 to 10% by weight.
- the amount of treatment with such a surface treating agent is less than 1% by weight based on zinc oxide, the effect of improving the dispersibility of the zinc oxide particles according to the present invention is poor. However, since the dispersibility is saturated, it is economically disadvantageous.
- the surface treatment with such a surface treatment agent is performed by mixing a predetermined amount of the surface treatment agent with the zinc oxide particles having the first (and second) coating layer and pulverizing the mixture.
- the zinc oxide particles having the first (and second) coating layer may be pulverized and then mixed with a surface treating agent.
- a surface treatment agent is added to the suspension. It can also be obtained by stirring, separating, drying and pulverizing, or by evaporating to dryness and pulverizing.
- the zinc oxide particles according to the present invention have a coating layer made of zinc silicate on the surface thereof, they do not promote the decomposition of thermoplastic resins such as polyethylene terephthalate-polycarbonate and are preferably used for these resins. Besides, it can be suitably used for other various resin products. In addition, since its solubility in pure water and sulfuric acid is extremely low and its photocatalytic activity is extremely suppressed, it can be used for a wide range of coatings, including outdoor applications where acid rain is a concern.
- the zinc oxide particles according to the present invention can be blended in a resin composition or a coating composition in the range of 1 to 80% by weight.
- Active oxygen is also known to be generated by ultraviolet light. Active oxygen includes superoxide, hydrogen peroxide, hydroxy radical, singlet oxygen, etc., which attack lipids, sugars, proteins, DNA, etc., and cause lipid peroxidation, protein denaturation, DNA damage, enzymes It is said to cause inhibition or the like and, as a result, induce or promote various diseases such as skin rot cancer and photoaging of the skin rot.
- the present invention in addition to the inherent ultraviolet shielding performance of zinc oxide, by dissolving iron or cobalt in zinc oxide, it is possible to shield ultraviolet rays in the A region having a long wavelength near 400 nm. And thus produced by ultraviolet light Not only can the human body be protected from active oxygen, but the coating of inert zinc silicate crystals on the surface separates zinc oxide particles from nearby substances, resulting in active oxygen due to the intrinsic photocatalytic function of zinc oxide. In particular, it can be suitably used for sunscreen cosmetics, because it effectively suppresses the formation of lipstick.
- the zinc oxide particles according to the present invention can be incorporated into cosmetics in the range of 1 to 80% by weight.
- the ultrafine zinc oxide used as the raw material zinc oxide particles had an average primary particle diameter of 0.0 obtained by evaporating and oxidizing zinc electroplating. 6 m ultra fine zinc oxide (FINEX-25 from Sakai Chemical Industry Co., Ltd.).
- Example 2 (S i O z as 4.0% by weight relative to the ultrafine zinc oxide) and sulfuric acid aqueous solution of zinc ultrafine zinc oxide of an aqueous suspension (2110 Concentration 1 0 0 g / L) in Kei acid sodium aqueous solution (ultrafine particles In the same manner as in Example 1 except that 11.0% by weight of ZnO based on zinc oxide) was added, 15% by weight of zinc oxide was added to the surface of zinc oxide particles by zinc silicate conversion. to obtain a zinc oxide ultrafine particle powder having a coating layer made of Kei zinc (Z n 2 S i 0 4 ).
- Example 3 S i O z as 4.0% by weight relative to the ultrafine zinc oxide and sulfuric acid aqueous solution of zinc ultrafine zinc oxide of an aqueous suspension (2110 Concentration 1 0 0 g / L) in Kei acid sodium aqueous solution (ultrafine particles In the same manner as in Example 1 except that 11.0% by weight of ZnO based on zinc oxide) was
- the dried product obtained in this manner is subjected to a jet mill pulverization, and a surface layer of zinc oxide particles is provided with a coating layer composed of 5% by weight of zinc silicate based on zinc oxide with respect to zinc oxide.
- a zinc oxide ultrafine particle powder having a second coating layer made of a 1 2 0 3 3 wt% moisture Aruminiumu oxides in terms relative to the outer zinc oxide.
- Example 1 While stirring the zinc oxide ultrafine particle powder obtained in Example 1 in a supermixer, 3% by weight of methylhydroxide polysiloxane based on zinc oxide (a product of Shin-Etsu Chemical Co., Ltd.) was added. Corn oil KF-99) was sprayed to obtain a zinc oxide ultrafine particle powder treated with methylhydrodiene polysiloxane. Comparative Example 1
- FIG. 1 shows an X-ray diffraction chart of the zinc oxide ultrafine particle powder according to Example 1 in which the measurement range 20 is in the range of 20 ⁇ to 60 ′.
- the ultrafine particles according to Comparative Example 2 were used.
- Fig. 2 shows the X-ray diffraction chart of the zinc oxide powder itself.
- Zinc oxide ultrafine particles powder obtained in Example 1 has 2 2 'and 2 6' 9 one Z n z S i 0 in the vicinity of the diffraction beak of.
- the ultrafine zinc oxide powder according to Example 3 also had the same X-ray diffraction pattern. Exam 2
- the ultrafine zinc oxide particles obtained in Examples 1 to 4 and Comparative Examples 1 and 2 were added to pure water and an aqueous solution of sulfuric acid at pH 4 (0.0005% by weight aqueous solution of sulfuric acid) at 25. was measured by atomic absorption analysis. The results are shown in Table 1.
- the ultrafine zinc oxide particles obtained in Example 5 were excluded from this test because they were water-repellent.
- the ultrafine zinc oxide powder according to the present invention has extremely low solubility in pure water and aqueous sulfuric acid.
- the zinc oxide ultrafine particle powders according to Comparative Examples 1 and 2 all reacted with oleic acid under the above conditions to form zinc oleate, so that the suspension was transparent at an atmosphere temperature above the melting point. It became a solution.
- the zinc oxide ultrafine particle powders according to Examples 1 to 3 did not substantially react with oleic acid and remained unreacted, and thus the suspension remained as it was. . Accordingly, it is shown that the zinc oxide ultrafine particle powder according to the present invention effectively suppresses the reaction with the fatty acid.
- the aqueous gel was dissolved in water to prepare an aqueous solution, and the aqueous solution was adjusted to a pH of 6.5 with an aqueous hydrating aqueous solution to give an aqueous gel containing 0.2% by weight of the aqueous polymer.
- Ultrafine zinc oxide particles were added to the aqueous gel of the water-soluble polymer at a concentration of 12% by weight, and the mixture was stirred at 500 rpm for 5 minutes using a homomixer.
- the slurry thus obtained was placed in a thermostat maintained at 38, allowed to stand for 7 days, and the viscosity at room temperature (25'C, B-type viscometer) was measured. The results are shown in Table 2.
- the ultrafine zinc oxide particles obtained in Example 5 were excluded from this test because they were water-repellent. Table 2
- the zinc oxide ultrafine powder according to the present invention hardly reacts with the above-mentioned polymer, so that the aqueous gel of the polymer retains its gel structure. , Maintained a high viscosity even after a lapse of time ⁇
- both the zinc oxide ultrafine particle powder according to Comparative Example 1 and the zinc oxide ultrafine particle powder according to Comparative Example 2 having no coating layer react with the carboxyl group of the above-mentioned polymer and form a gel of the polymer. This was presumably due to the alteration of the structure, but the viscosity dropped significantly over time.
- the ultrafine zinc oxide powder according to Comparative Example 1 Since it has a coating layer made of water gay oxide, the water of crystallization of the above-mentioned wet gay oxide hydrolyzes the polyethylene terephthalate resin at an ambient temperature of 260 It is shown that it became a thing.
- the zinc oxide ultrafine particle powder according to Comparative Example 2 also has a tendency to decompose the polyethylene terephthalate resin since the melt flow rate is larger than that of the resin alone.
- the ultrafine zinc oxide powder according to the present invention has a coating layer made of zinc gayate having no crystallization water on its surface. Does not cause hydrolysis of terephthalate resin. Therefore, the zinc oxide ultrafine particle powder according to the present invention can be used as an ultraviolet shielding agent by kneading it into a polyethylene terephthalate resin without any problem of hydrolysis of the resin. Exam 6
- the ultrafine zinc oxide particles obtained in Examples 1 to 5 and Comparative Examples 1 and 2 were evaluated for their ability to block ultraviolet rays and transparency of visible light.
- the zinc oxide ultrafine particle powder according to the present invention has a high-density coating layer made of zinc silicate, the ultraviolet light shielding property and visible light transparency inherent to ultrafine zinc oxide are not impaired at all, and excellent ultraviolet light shielding And high visible light transparency.
- Example 6
- aqueous ferrous sulfate solution (4% by weight based on ultrafine zinc oxide) was added to an aqueous suspension of ultrafine zinc oxide (ZnO concentration 100 g / L) at room temperature with stirring.
- aqueous sodium hydroxide solution were added simultaneously over 60 minutes. During this time, the pH of the suspension was maintained at 9.
- the resulting aqueous suspension was heated to 60 ° C. and added to an aqueous sodium silicate solution (1.3% by weight as Sio 2 based on ultrafine zinc oxide).
- an aqueous solution of zinc sulfate (3.7% by weight as Z ⁇ ⁇ based on ultrafine zinc oxide).
- Example 8 In the same manner as in Example 6, except that an aqueous ferrous sulfate solution (8% by weight based on zinc oxide) was added to an aqueous suspension of ultrafine zinc oxide (ZnO concentration lOO gZL), with 8% by weight of iron iron conversion is a solid solution in the zinc oxide with respect to zinc oxide, Kei zinc against the zinc oxide on the particle surface (Z n z S i O ⁇ ) conversion Ki 5.0 wt% Thus, an iron-dissolved zinc oxide ultrafine particle powder having a coating layer composed of zinc silicate was obtained.
- Example 8 An aqueous ferrous sulfate solution (8% by weight based on zinc oxide) was added to an aqueous suspension of ultrafine zinc oxide (ZnO concentration lOO gZL), with 8% by weight of iron iron conversion is a solid solution in the zinc oxide with respect to zinc oxide, Kei zinc against the zinc oxide on the particle surface (Z n z S i O ⁇ ) conversion Ki 5.0 wt
- aqueous zinc sulfate solution 110 concentration: 100 g / L
- aqueous solution of ferrous sulfate based on zinc oxide in terms of iron was mixed with a 4% by weight aqueous solution of ferrous sulfate based on zinc oxide in terms of iron, and the pH of the resulting aqueous mixture was adjusted using sodium carbonate aqueous solution. It was set to 9. After aging for 30 minutes, stirring the resulting aqueous suspension Nigoeki in 60 hand, (1.3 wt% as S i O z with respect to zinc oxide) Gay Sanna thorium aqueous solution to an aqueous solution of zinc (zinc oxide sulfate 3.7% by weight as ZnO).
- the dried product obtained in the same manner as in Example 6 was fired in air at 800 ° C for 60 minutes, then crushed with a hammer mill, and dispersed in water so that the zinc oxide concentration became 100 gZL. Then, the mixture was pulverized with a sand mill to prepare an aqueous suspension of iron-dissolved ultrafine zinc oxide. Under stirring the suspension is ⁇ 6 0 hands, A 1 2 0 3 in terms of 3% by weight of aluminate Sanna Toriumu aqueous solution added to zinc oxide, after aging for 1 0 minutes question, sulfuric acid And neutralized to pH 7.0.
- a mixed powder consisting of 92 parts by weight of ultrafine zinc oxide and 8 parts by weight of ultrafine iron oxide (FRO-3 manufactured by Sakai Chemical Industry Co., Ltd.) having an average particle diameter of 0.03 m was prepared. Comparative Example 4
- Each of the iron-dissolved zinc oxide ultrafine particles obtained in Examples 6 and 8 showed substantially the same X-ray diffraction pattern as the zinc oxide ultrafine particles obtained in Example 1, and 22. ⁇ one near 2 6 ⁇ Z n 2 S i 0 with a fourth diffraction beak. Exam 8
- each of the iron-dissolved zinc oxide ultrafine particles obtained in Examples 6 and 7 was mixed with oleic acid at room temperature to prepare a suspension, and the suspension was prepared under an atmosphere of 12 O'C. Although retained, the iron-dissolved ultrafine zinc oxide particles did not substantially react with the oleic acid and remained unreacted, and thus remained as a suspension.
- Exam 9 each of the iron-dissolved zinc oxide ultrafine particles obtained in Examples 6 and 7 was mixed with oleic acid at room temperature to prepare a suspension, and the suspension was prepared under an atmosphere of 12 O'C. Although retained, the iron-dissolved ultrafine zinc oxide particles did not substantially react with the oleic acid and remained unreacted, and thus remained as a suspension.
- the iron-dissolved ultrafine zinc oxide particles obtained in Examples 6 to 9 and Comparative Example 3 were examined for the effect of shielding ultraviolet rays in the A region and the transparency of visible light.
- 2 g of iron-dissolved ultrafine zinc oxide powder, 4 g of room-temperature-dried acryl resin (A-132, manufactured by Dainippon Ink and Chemicals, Inc., 50% by weight solids) and a solvent To obtain a dispersion of the iron-dissolved ultrafine zinc oxide powder.
- 12 g of a normal-temperature-dried type of acrylic resin was further added thereto, mixed well, and dispersion-stabilized to prepare a paint containing 20% by weight of iron-dissolved zinc oxide ultrafine particles. This was applied on a polyethylene terephthalate film with a bar coater # 10 and dried at room temperature for 4 hours to obtain a test piece.
- the ultrafine particles of the iron-dissolved zinc oxide according to the present invention have a low transmittance of ultraviolet light in the A region, and have a longer wavelength region than 380 nm, which is the original absorption edge of zinc oxide. Has an improved shielding effect against ultraviolet rays. Further, the transparency is almost the same as that of the ultrafine zinc oxide book of Comparative Example 4. Exam 1 0
- the iron-dissolved zinc oxide ultrafine particles obtained in Examples 6 to 9 and Comparative Example 3 were subjected to pure water and a sulfuric acid solution (pH 0.00 (An aqueous solution of 0.5% by weight sulfuric acid). The results are shown in Table 6. As is clear from Table 6, the iron-dissolved zinc oxide ultrafine particles according to the present invention have extremely low solubility in water and aqueous sulfuric acid. Table 6
- Paints containing the iron-dissolved zinc oxide ultrafine particles obtained in Examples 6 to 9 and Comparative Examples 3 and 4 were prepared, and their weather resistance was examined by an outdoor exposure test.
- Example 10 As is clear from Table 7, according to the paints using zinc oxide according to Comparative Examples 3 and 4, the discoloration of the coated surface is large, whereas the iron-dissolved zinc oxide according to the present invention is discolored. And has excellent protection effect on the substrate.
- Example 10
- a zinc sulfate aqueous solution ( ⁇ 110 concentration: 100 g / L) was mixed with a 12% by weight aqueous cobaltous sulfate solution in terms of cobalt oxide (CoO) based on zinc oxide, and the resulting mixed aqueous solution was obtained.
- An aqueous solution of sodium carbonate was added to the mixture over 60 minutes so that the pH became 8, and the mixture was aged for 30 minutes.
- Example 1 2 An aqueous sodium hydroxide solution was added to the aqueous suspension thus obtained, the pH was adjusted to 7.5, and the mixture was aged for 30 minutes.
- the suspension thus obtained was cooled to room temperature, filtered, washed with water, and dried by heating at 120 ° C. for 5 hours.
- the obtained dried product is fired in air at 900 ° C for 60 minutes, then pulverized by jet milling to oxidize 12% by weight of cobalt oxide (CoO) based on zinc oxide. together in solid solution in the zinc, cobalt solid solution of zinc oxide with a coating layer comprising a 8.9% gay zinc in the gay zinc against the zinc oxide on the surface (Z n 2 S i 0 4 ) ⁇ Ultra fine powder was obtained.
- Example 1 2 An aqueous sodium hydroxide solution was added to the aqueous suspension thus obtained, the pH was adjusted to 7.5, and the mixture was aged for 30 minutes.
- the suspension thus obtained was cooled to room temperature, filtered, washe
- the dried product obtained in the same manner as in Example 11 was fired at 800 and then for 60 minutes, and then crushed by a hammer mill so that the zinc oxide (ZnO) concentration became 100 g / L. To It was dispersed in water and pulverized with a sand mill to prepare an aqueous suspension of ultrafine zinc oxide solid solution zinc oxide.
- a zinc sulfate aqueous solution ( ⁇ 110 concentration: 100 g / L) was mixed with a 12% by weight aqueous solution of cobaltous sulfate in terms of cobalt oxide (CoO) with respect to zinc oxide, and an aqueous sodium carbonate solution was added.
- CoO cobalt oxide
- aqueous sodium carbonate solution was added.
- the mixture was filtered, washed with water, heated with 12 O'C for 5 hours, and dried.
- the obtained dried product was calcined at 400 ° C for 60 minutes, then pulverized by agit mill, and a solid solution of 12% by weight of cobalt oxide (CoO) in terms of cobalt oxide was dissolved in zinc oxide. Ultrafine zinc oxide particles were obtained. Comparative Example 6
- the cobalt-dissolved zinc oxide ultrafine particles obtained in Examples 10 and 11 show substantially the same X-ray diffraction pattern as the zinc oxide ultrafine particles obtained in Example 1, and 22 2 and 26 It has a diffraction beak near ⁇ — Z n z S i 0 4 .
- Exam 1 3
- the cobalt-dissolved zinc oxide ultrafine particle powders obtained in Examples 10 to 12 and Comparative Examples 5 and 6 were examined for the ultraviolet shielding effect in region A and the transparency of visible light.
- the mixture was treated with a car (Model 540, manufactured by Let Devil Co., Ltd.) to obtain a dispersion of the above-mentioned ultra-fine powder of cobalt solid solution zinc oxide.
- test specimen was exposed to ultraviolet light in the A region at wavelengths of 350 nm and 385 nm and to the visible region at 550 nm.
- the light transmittance of was measured, and the shielding ability and transparency of the A region ultraviolet rays were evaluated. Further, the total transmittance in the measurement range of 250 to 800 nm was measured. The results are shown in Table 8 and FIG. Table 8
- the ultrafine particles of the cobalt-dissolved zinc oxide according to the present invention have a remarkably low transmittance in the ultraviolet region A, particularly around 400 nm, and absorb the original zinc oxide.
- the effect of shielding ultraviolet rays in the wavelength region longer than the end of 380 nm is improved. Further, the transparency is almost the same as that of the ultrafine zinc oxide of Comparative Example 6.
- the zinc oxide particles according to the present invention have a coating layer made of zinc silicate on the surface, the zinc oxide particles have excellent ultraviolet ray shielding ability and high visible light transparency, and have the inherent surface activity of zinc oxide. Therefore, its solubility in water and aqueous sulfuric acid is extremely low, and its photocatalytic function is also suppressed, making it suitable as an ultraviolet shielding agent in various fields such as resins, paints, and cosmetics. Can be used.
- the zinc oxide particles having a coating layer made of zinc gayate on the surface thereof and having iron or cobalt as a solid solution are provided with ultraviolet rays having a wavelength longer than the ultraviolet shielding wavelength of the A region inherent to zinc oxide. Can be shielded, and it has excellent transparency.
Description
Claims
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US09/743,580 US6660380B1 (en) | 1999-05-12 | 2000-05-11 | Zinc oxide particles having suppressed surface activity and production and use thereof |
EP00927752.6A EP1112964B1 (en) | 1999-05-12 | 2000-05-11 | Zinc oxide particles having suppressed surface activity and production and use thereof |
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WO2015098993A1 (ja) * | 2013-12-27 | 2015-07-02 | 堺化学工業株式会社 | 酸化亜鉛粒子、それらの製造方法、紫外線遮蔽剤及び化粧料 |
EP3127869B1 (en) * | 2014-03-31 | 2021-06-09 | Sumitomo Osaka Cement Co., Ltd. | Silicon oxide-coated zinc oxide, method for producing same, and composition and cosmetic including silicon oxide-coated zinc oxide |
WO2018154364A1 (en) * | 2017-02-27 | 2018-08-30 | Tata Chemicals Limited | A composition redispersible in polar and non-polar solvents |
WO2023087056A1 (en) * | 2021-11-16 | 2023-05-25 | Advance ZincTek Limited | Zinc oxide and aluminium oxide containing materials |
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Also Published As
Publication number | Publication date |
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EP1112964A4 (en) | 2008-01-23 |
EP1112964A1 (en) | 2001-07-04 |
US6660380B1 (en) | 2003-12-09 |
EP1112964B1 (en) | 2017-02-22 |
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